I have had an 80ft Heights Al tower up since 1976, and I bought it
used back then! TH-11 on top. The first three sections might be
unique in that the tubing is 0.25inch wall thickness. I originally
installed it self supporting. During a once-per-hundred-years
blizzard in1978 it was waving around like a mobile whip. So I added
two sets of phillystran guys. They are not under much tension to
limit down force on the tower; just limit the sway. This is because I
have always been told that Al can not stand compression loads like steel.
ron w8gus
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